Wonderful, wonderful spot. Even though it seems like a large crowd when you're in the locker room, when you enter the lagoon itself it doesn't feel crowded at all. That may have been because it was a cool day with little wind, so there was a lot of evaporated mist obscuring any view. We slowly moved through the warm water from place to place- the mud bar, the actual bar- discovering different nooks and crannies. There is cool water continuously pouring out to drink under one of the bridges, so if you booked a package that includes a free drink at the bar don't use it on water (try the cider if you're of age).
We ate in the Lava restaurant at about 3PM and it was nearly empty, so you can get a table with this view. Fish dishes were excellent, meat dish we had underwhelmed. You can eat in the restaurant in your robes, but for me, food this good deserves better dress so we ate in our street clothes.
There is a walkway outside that runs along a pool of the same water; take it back to the parking lot. All told we spent a little over 5 hours here, so try to avoid doing it on a tight schedule. It does sell out; for our 3 days in Iceland only one day had tickets that fit our schedule when we booked a month in advance.
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